2922 積層様式の異なるクロスプライCFRP積層板の切欠強度とCohesive Zone Modelによる解析(S27-1 複合材料の動向とその加工技術(1),S27 複合材料の動向とその加工技術)

概要

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Effects of stacking-sequence on tensile strength of cross-ply CFRP laminates have been studied. Existing strength models applicable to fracture strength prediction have also been examined. Three kinds of non-woven cross-ply laminates with the same total number of plies except for different number of adjacent laminae of the same orientation are treated. Static tension tests are performed on three kinds of specimens of the same size, i.e. unnotched (UN), double-edge notched (DEN), and center holed (CH) specimens, for each type of laminates. To elucidate sensitivity to the size of stress risers, the DEN and CH specimens are tested for three different kinds of notch lengths and hole radii, respectively. It has clearly been observed that the tensile fracture strengths of the DEN and CH specimens significantly reduce as the notch size increases. The sensitivity to notches is highest in the case of alternating cross-ply configuration. Validity of an analytical cohesive zone model is also evaluated by comparing the predicted and observed strengths of the unnotched and notched cross-ply laminates.
一般社団法人日本機械学会の論文
2006-09-15